When it's damp, does it come off easier? Do you think you can post a picture of what it looks like? I'm not sure if the paper is in bits yet, or if it's still in large-ish pieces?
Can you try a lint roller on it after you've dampened the paper? Usually paper comes off easier if it's wet, so let the water soak in a bit and then try it? So sorry this happened to you! You do beautiful work and it's frustrating when something new we've tried doesn't work out.